v2.2-paseo-providers: Paseo provider stack + v2.2.1 pane-scoped chat fixes

Ship Paseo-equivalent provider snapshot, AgentComposerBar, ACP dispatch
rewrite with streaming/persist, permission prompts, and agent commands.
Follow-up: pane-scoped chat resolution, CoderMessageList tool timeline,
WS user-delta replace, and inference orphan tool_call stripping.
Archive openspec v2-2; update CHANGELOG and CURRENT.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/coder/src/services/__tests__/provider-commands.test.ts

@@ -0,0 +1,26 @@
+import { describe, it, expect } from 'vitest';
+import { getManifestCommands, mergeCommands, PROVIDER_COMMANDS } from '../provider-commands.js';
+
+describe('provider-commands', () => {
+  it('defines commands for every external harness', () => {
+    for (const name of ['claude', 'opencode', 'cursor', 'goose', 'qwen', 'copilot']) {
+      expect(getManifestCommands(name).length, name).toBeGreaterThan(0);
+    }
+  });
+
+  it('boocode uses frontend skills — empty manifest', () => {
+    expect(getManifestCommands('boocode')).toEqual([]);
+    expect(PROVIDER_COMMANDS.boocode).toEqual([]);
+  });
+
+  it('mergeCommands dedupes by name with later override', () => {
+    const merged = mergeCommands(
+      [{ name: 'help', description: 'a' }],
+      [{ name: 'help', description: 'b' }, { name: 'clear' }],
+    );
+    expect(merged).toEqual([
+      { name: 'clear' },
+      { name: 'help', description: 'b' },
+    ]);
+  });
+});